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WO1995019181A1 - PROCEDE DE TRAITEMENT DE LA PARASITOSE A L'AIDE D'ANTAGONISTES DE L'IgE - Google Patents

PROCEDE DE TRAITEMENT DE LA PARASITOSE A L'AIDE D'ANTAGONISTES DE L'IgE Download PDF

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Publication number
WO1995019181A1
WO1995019181A1 PCT/US1995/000087 US9500087W WO9519181A1 WO 1995019181 A1 WO1995019181 A1 WO 1995019181A1 US 9500087 W US9500087 W US 9500087W WO 9519181 A1 WO9519181 A1 WO 9519181A1
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Prior art keywords
ige
antibody
antagonist
receptor
parasite
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PCT/US1995/000087
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English (en)
Inventor
Payman Amiri
Mary Haak-Frendscho
Paula M. Jardieu
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Genentech, Inc.
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Filing date
Publication date
Application filed by Genentech, Inc. filed Critical Genentech, Inc.
Priority to JP51821495A priority Critical patent/JP3825798B2/ja
Priority to APAP/P/1996/000875A priority patent/AP660A/en
Priority to EP95907302A priority patent/EP0739214B1/fr
Priority to DK95907302T priority patent/DK0739214T3/da
Priority to DE69501817T priority patent/DE69501817T2/de
Priority to MX9602818A priority patent/MX9602818A/es
Publication of WO1995019181A1 publication Critical patent/WO1995019181A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/42—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins
    • C07K16/4283—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins against an allotypic or isotypic determinant on Ig
    • C07K16/4291—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins against an allotypic or isotypic determinant on Ig against IgE
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/16—Drugs for disorders of the alimentary tract or the digestive system for liver or gallbladder disorders, e.g. hepatoprotective agents, cholagogues, litholytics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P33/00—Antiparasitic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P33/00—Antiparasitic agents
    • A61P33/10—Anthelmintics
    • A61P33/12—Schistosomicides
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
    • C07K14/70503—Immunoglobulin superfamily
    • C07K14/70535—Fc-receptors, e.g. CD16, CD32, CD64 (CD2314/705F)
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2803—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
    • C07K16/283—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily against Fc-receptors, e.g. CD16, CD32, CD64
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

Definitions

  • This invention relates to methods for preventing or treating parasitic infection.
  • an IgE antagonist is administered to a patient having or at risk of having a parasitic infection, to eliminate or render undetectable the patient's IgE levels during the course of the infection.
  • Elevated IgE antibody production is a hallmark of infection with parasitic helminths, including Schistosoma mansoni (Finkelman, F.D. , et al., Immun. Today 12:462-466 (1991)) .
  • This IgE response is commonly considered an essential component of the host defense against metazoan parasites (Capron, A. et al . , Nature 253:474-475 (1975); Capron, A., et al., Prog. Allergy 31:234-267 (1982); Joseph, M. , et al . , Nature 303:810- 812 (1983)) .
  • B cell depletion prevents development of immunity (Bazin, H. , et al . , J. Immun. 124:2373-2377 (1980)); effective immunity can be adoptively transferred by IgE antibodies (Capron, A. et al . , Ann. Rev. Immun . 3:455-476 (1985); Vignali, D.A.A. et al . , Immun . Today 10:410-416 (1989)); IgE can directly mediate resistance through eosinophil, macrophage, and platelet-mediated cytotoxicity (Joseph, M. , et al . , Nature 303:810-812 (1983); Capron, M.
  • the present inventors have discovered that elimination of IgE with an IgE antagonist, as measured by reduction of IgE to an undetectable level in an ELISA assay, resulted in decreased worm burden, decreased egg production, and decreased hepatospenomegaly in murine schistosomiasis.
  • Antagonists of IgE in the form of receptors, anti-IgE antibodies, binding factors, or fragments thereof have been disclosed in the art.
  • U.S. 4,962,035 discloses DNA encoding the alpha-subunit of the mast cell IgE receptor or an IgE binding fragment thereof.
  • Hook et al . ⁇ Federation Proceedings Vol. 40, No. 3, Abstract #4177 disclose monoclonal antibodies, of which one type is anti-idiotypic, a second type binds to common IgE determinants, and a third type is directed towards determinants hidden when IgE is on the basophil surface.
  • U.S. 4,940,782 discloses monoclonal antibodies which react with IgE when it is unbound and thereby inhibit IgE binding to mast cells, and react with IgE when it is bound to the B-cell FcE receptor, but do not bind with
  • IgE when it is bound to the mast cell FcE receptor, nor block the binding of IgE to the B-cell receptor.
  • U.S. 4,946,788 discloses a purified IgE binding factor and fragments thereof, and monoclonal antibodies which react with IgE binding factor and lymphocyte cellular receptors for IgE, and derivatives thereof.
  • U.S. 5,091,313 discloses antigenic epitopes associated with the extracellular segment of the domain which anchors immunoglobulins to the B cell membrane. The epitopes recognized are present on IgE-bearing B cells but not basophils or in the secreted, soluble form of IgE.
  • U.S. 5,252,467 discloses a method for producing antibodies specific for such antigenic epitopes.
  • U.S. 5,231,026 discloses DNA encoding murine-human antibodies specific for such antigenic epitopes.
  • WO 89/06138 discloses unique antigenic determinants of IgE present on
  • IgE bearing B-cells but not basophils One class of these epitopes is at or near the FceR binding site on IgE, while another class of associated with the extracellular segment of the domain of e chains which anchor IgE to the B cell membrane.
  • U.S. 4,714,759 discloses an immunotoxin in the form of an antibody or an antibody fragment coupled to a toxin to treat allergy.
  • Flores-Romo et al. ⁇ Science 261:1038-1041 (1993)) disclose inhibition of an in vivo antigen-specific IgE response by antibodies to CD23.
  • One aspect of the invention is a method of treating infection of a patient by a parasite comprising administration of a therapeutically effective amount of an IgE antagonist to the patient.
  • Another aspect of the invention is a method of reducing the number of eggs or adult worms in a patient infected by a parasite comprising administration of a therapeutically effective amount of an IgE antagonist to the patient.
  • Another aspect of the invention is a method of reducing hepatosplenomegaly in a patient infected by a parasite comprising administration of a therapeutically effective amount of an IgE antagonist to the patient.
  • Figure 1 is a graph depicting the effects of anti-IgE monoclonal antibodies (mAb) on serum IgE levels.
  • mAb monoclonal antibodies
  • mice were bled, then retreated in vivo with 20 ⁇ g mAb at 1, 2, 3, 4, and 5 weeks, and with 100 ⁇ g at weeks 6 and 7 (400 ⁇ g total anti-IgE mAb) , or with 20 ⁇ g mAb anti-IgE mAb at weeks 6 and 7 (240 ⁇ g total anti-IgE mAb) .
  • Total serum IgE was determined by ELISA.
  • Polyclonal rabbit anti-mouse IgE (Genentech, Inc.) was diluted to 2 ⁇ g/ml in 0.05M Na 2 C0 3 buffer, pH 9.6, and coated onto flat-bottomed microtiter plates.
  • the amount of murine IgE that bound to the anti-mouse IgE was detected using biotinylated IgE receptor I-IgG immunoadhesin (Haak- Frendscho, M. et al . , J. Immun. 151:351-358 (1993)).
  • Assays were developed using horseradish peroxidase conjugated to streptavidin (Zymed) .
  • Figures 2A and 2B are graphs depicting the effect of anti-IgE on spleen weight (2A) and liver weight (2B) .
  • Figure 3 (A-D) is a photograph depicting the histopathology of livers and spleens from infected mice. To evaluate histopathology, spleens and livers were removed from mice treated with high dose anti-IgE or control IgG, eight weeks after infection with cercariae as described in the legend to Figure 1.
  • Figure 4 is a graph depicting the effect of anti-IgE on serum IL-4.
  • Serum IL-4 was determined by ELISA using 1 ⁇ g/ml anti-mouse IL-4 mAb (BVD4-1D11, rat IgG 2b ; Pharmingen) in 0.05M Na 2 C0 3 , pH 9.6, coated onto flat-bottomed microtiter plates.
  • IL-4 was detected with biotin-conjugated anti-mouse IL-4 (BVD6-24G2, rat IgG ⁇ ,- Pharmingen) and developed with horseradish peroxidase- streptavidin (Zymed) .
  • FIG. 5 is a graph depicting CD23 expression on B cells.
  • Spleens were removed from anti-IgE mAb and control antibody treated mice after eight weeks of infection with S. mansoni . Their cells were dispersed with frosted glass slides, washed with phosphate buffered saline (PBS) containing 1% bovine serum albumin (BSA) and 0.01% sodium azide, then stained with appropriate dilutions of monoclonals recognizing CD45R (RA3-6B2, Red6 13- conjugated rat IgG 2a ; GIBCO) and CD23 (B3B4, FITC- conjugated rat IgG a ; Pharmingen) .
  • PBS phosphate buffered saline
  • BSA bovine serum albumin
  • IgE antagonist refers to a substance which inhibits the biological activity of IgE.
  • Such antagonists include but are not limited to anti-IgE antibodies, IgE receptors, anti-IgE receptor antibodies, variants of IgE antibodies, ligands for the IgE receptors, and fragments thereof.
  • Antibody antagonists may be of the IgA, IgD, IgG, IgE, or IgM class.
  • the antibody antagonist may be bispecific, i.e., comprise an antigen binding site and an amino acid sequence capable of binding a target involved in the initiation or development of parasitic infection.
  • Variant IgE antibodies typically have amino acid substitutions or deletions at one or more amino acid residues.
  • Ligands for IgE receptors include but are not limited to IgE and anti-receptor antibodies, and fragments thereof capable of binding to the receptors, including amino acid substitution and deletion variants, and cyclized variants.
  • IgE antagonists act by blocking the binding of IgE to its receptors on B cells, mast cells, or basophils, either by blocking the binding site on the IgE molecule or blocking its receptors. Additionally, in some embodiments of the invention, IgE antagonists act by binding soluble IgE and thereby removing it from circulation. The IgE antagonists of the invention can also act by binding to IgE on B cells, thereby eliminating clonal populations of B cells. The IgE antagonists of the instant invention can also act by inhibiting IgE production. Preferably, the IgE antagonists of the instant invention do not result in histamine release from mast cells or basophils.
  • terapéutica amount denotes an amount that prevents or ameliorates symptoms of a disorder or responsive pathologic physiological condition.
  • Polypeptide as used herein refers generally to peptides and proteins having at least about two amino acids.
  • the IgE antagonists of the instant invention can be used to treat infection by parasitic helminths, including nematodes, trematodes, and cestodes, and other parasites which are associated with elevated IgE levels.
  • IgE antagonists and methods for designing and producing them are known in the art (see Description of the Background and Related Art) .
  • IgE antagonist is an antibody, it can be any type of immunoglobulin, such as IgG, IgA, IgM, IgD, and IgE, including polyclonal and monoclonal forms of such antibodies.
  • Animals ordinarily are immunized against the cells or immunogenic conjugates or derivatives by combining 1 mg or 1 ⁇ g of IgE with Freund's complete adjuvant and injecting the solution intradermally at multiple sites.
  • the animals are boosted with 1/5 to 1/10 the original amount of conjugate in Freund-s complete adjuvant by subcutaneous injection at multiple sites.
  • animals are bled and the serum is assayed for anti-IgE titer. Animals are boosted until the titer plateaus.
  • the animal is boosted with a conjugate of the same IgE, but conjugated to a different protein and/or through a different cross-linking agent.
  • Conjugates also can be made in recombinant cell culture as protein fusions. Also, aggregating agents such as alum can be used to enhance the immune response.
  • Monoclonal antibodies are prepared by recovering spleen cells from immunized animals and immortalizing the cells in conventional fashion, e.g. by fusion with myeloma cells or by Epstein-Barr (EB) -virus transformation and screening for clones expressing the desired antibody.
  • EB Epstein-Barr
  • hybrid cell lines that secrete high levels of monoclonal antibodies against many specific antigens.
  • the hybrid cell lines can be maintained in vi tro in cell culture media.
  • the cell lines producing the antibodies can be selected and/or maintained in a composition comprising the continuous cell line in hypoxanthine-aminopterin thymidine (HAT) medium.
  • HAT hypoxanthine-aminopterin thymidine
  • the hybrid cell lines can be stored and preserved in any number of conventional ways, including freezing and storage under liquid nitrogen. Frozen cell lines can be revived and cultured indefinitely with resumed synthesis and secretion of monoclonal antibody.
  • the secreted antibody is recovered from tissue culture supernatant by conventional methods such as precipitation, ion-exchange chromatography, affinity chromatography, or the like.
  • the antibodies described herein are also recovered from hybridoma cell cultures by conventional methods for purification of IgG or IgM, as the case may be, that heretofore have been used to purify these immunoglobulins from pooled plasma, e. g. , ethanol or polyethylene glycol precipitation procedures.
  • the purified antibodies are sterile-filtered.
  • mouse monoclonal antibodies are used, the invention is not so limited; in fact, human antibodies can be used. Such antibodies can be obtained, for example, by using human hybridomas (Cote et al . , Monoclonal Antibodies and Cancer Therapy. Alan R. Liss, p. 77 (1985)) . In fact, according to the invention, techniques developed for the production of chimeric antibodies (Cabilly et al., U.S. Patent No. 4,816,567, Morrison et al . , Proc. Natl. Acad. Sci.. __-. 6851 (1984); Boulianne et al .
  • chimeric antibody is used herein to describe a polypeptide comprising at least the antigen binding portion of an antibody molecule linked to at least part of another protein (typically an immunoglobulin constant domain) .
  • such chimeric antibodies contain about one third rodent (or other non-human species) sequence and thus are capable of eliciting a significant anti-globulin response in humans.
  • rodent or other non-human species
  • Humanized antibodies are used to reduce or eliminate any anti-globulin immune response in humans.
  • humanized antibodies are typically human antibodies in which some amino acid residues from the complementarity determining regions (CDRs) , the hypervariable regions in the variable domains which are directly involved with formation of the antigen-binding site, and possibly some amino acids from the framework regions (FRs) , the regions of sequence that are somewhat conserved within the variable domains, are substituted by residues from analogous sites in rodent antibodies.
  • CDRs complementarity determining regions
  • FRs framework regions
  • substituting CDRs from rodent antibodies for the human CDRs in human frameworks is sufficient to transfer high antigen binding affinity (Jones et al . , Nature. 321: 522-525 (1986); Verhoeyen et al . , Science. 223.' 1534-1536 (1988)) whereas in other cases it is necessary to additionally replace one (Riechmann et al . , supra) or several (Queen et al . , supra) FR residues. See also Co et al . , supra .
  • the invention also encompasses the use of human antibodies produced in transgenic animals.
  • DNA encoding the antibody of interest is isolated and stably incorporated into the germ line of an animal host.
  • the antibody is produced by the animal and harvested from the animal ⁇ s blood or other body fluid.
  • a cell line that expresses the desired antibody can be isolated from the animal host and used to produce the antibody in vitro, and the antibody can be harvested from the cell culture by standard methods.
  • Anti-IgE antibody fragments can also be used in the methods of the invention. Any fragment of an anti-IgE antibody capable of blocking or disrupting IgE interaction with its receptor is suitable for use herein.
  • Suitable anti-IgE antibody fragments can be obtained by screening combinatorial variable domain libraries for DNA capable of expressing the desired antibody fragments. These techniques for creating recombinant DNA versions of the antigen-binding regions of antibody molecules (known as F(ab) fragments), which bypass the generation of monoclonal antibodies, are encompassed within the practice of this invention.
  • F(ab) fragments recombinant DNA versions of the antigen-binding regions of antibody molecules
  • cDNA complementary DNA
  • One can rapidly generate and screen great numbers of functional F(ab) fragments for those that bind the antigen of interest.
  • IgE-binding molecules F(ab) fragments with specificity for the IgE protein
  • soluble IgE receptor can be used as the IgE antagonist.
  • Soluble receptors suitable for use herein include, for example, molecules comprising the IgE binding site in the extracellular domain (exodomain) of the FceRI ⁇ chain.
  • the chain of FceRI can be genetically modified such that the exodomain is secreted as a soluble protein in a recombinant expression system according to the method of Blank et al . , J. Biol. Chem.. 266: 2639-2646 (1991) or Qu et al . , i.
  • the invention also encompasses the use of IgE-binding peptides in addition to anti-IgE antibodies and soluble receptor. Any IgE-binding peptide capable of disrupting or blocking the interaction between IgE and its receptors is suitable for use herein.
  • IgE antagonists which interfere with IgE/receptor interaction by binding to IgE, such as anti-IgE antibodies, fragments thereof, soluble IgE receptor and other IgE-binding peptides described above, the invention encompasses the use of IgE antagonists which disrupt IgE/receptor interaction by binding to IgE, such as anti-IgE antibodies, fragments thereof, soluble IgE receptor and other IgE-binding peptides described above, the invention encompasses the use of IgE antagonists which disrupt
  • IgE/receptor interaction by competing with IgE for binding to its receptor, thereby lowering the available IgE receptor.
  • IgE variants are an example of a receptor-binding competitor that is suitable for use in the methods of the invention.
  • IgE variants are forms of IgE possessing an alteration, such as an amino acid substitution or substitutions and/or an amino acid deletion or deletions, wherein the altered IgE molecule is capable of competing with IgE for binding to its receptors. Fragments of IgE variants are also suitable for use herein. Any fragment of an IgE variant capable of competing with IgE for binding to its receptors can be used in the methods of the invention.
  • the invention also encompasses the use of IgE receptor-binding peptides in addition to IgE variants and fragments thereof. Any IgE receptor-binding peptide capable of disrupting or blocking the interaction between IgE and its receptors is suitable for use herein.
  • the amount of IgE antagonist delivered to the patient to be used in therapy will be formulated and dosages established in a fashion consistent with good medical practice taking into account the disorder to be treated, the condition of the individual patient, the site of delivery, the method of administration and other factors known to practitioners.
  • the dose of the IgE antagonist administered will be dependent upon the properties of the IgE antagonist employed, e.g. its binding activity and in vivo plasma half-life, the concentration of the IgE antagonist in the formulation, the administration route, the site and rate of dosage, the clinical tolerance of the patient involved, the pathological condition afflicting the patient and the like, as is well within the skill of the physician.
  • the IgE antagonists are administered subcutaneously or intravenously about once a week for about two months, in amounts of about 2 to 3 mg/kg. Typically, when anti-IgE antibody is used, sufficient antibody is administered so that its concentration is about twice the serum IgE level.
  • Antagonists of the invention are administered by intravenous intrapulmonary, intraperitoneal subcutaneous or other suitable routes. It is envisioned that injections (intramuscular or subcutaneous) will be the primary route for therapeutic administration of the IgE antagonist of this invention, although intravenous delivery, or delivery through catheter or other surgical tubing is also used.
  • Alternative routes include suspensions, tablets, capsules and the like for oral administration, commercially available nebulizers for liquid formulations, and inhalation of lyophilized or aerosolized microcapsules, and suppositories for rectal or vaginal administration.
  • Liquid formulations can be utilized after reconstitution from powder formulations. Additional pharmaceutical methods may be employed to control the duration of action of the antagonists of this invention.
  • the antagonists also may be entrapped in microcapsules prepared, for example, by coacervation techniques or by interfacial polymerization (for example, hydroxymethylcellulose or gelatin-microcapsules and poly- [methylmethacylate) microcapsules, respectively) , in colloidal drug delivery systems (for example, liposomes, albumin microspheres, microemulsions, nano-particles and nanocapsules) , or in macroemulsions.
  • colloidal drug delivery systems for example, liposomes, albumin microspheres, microemulsions, nano-particles and nanocapsules
  • the formulations of the subject invention can contain other components in amounts not detracting from the preparation of stable forms and in amounts suitable for effective, safe pharmaceutical administration.
  • other pharmaceutically acceptable excipients well known to those skilled in the art can form a part of the subject compositions. These include, for example, salts, various bulking agents, additional buffering agents, chelating agents, antioxidants, cosolvents and the like; specific examples of these include tris- (hydroxymethyl)aminomethane salts ("Tris buffer”), -and disodium edetate.
  • Tris buffer tris- (hydroxymethyl)aminomethane salts
  • IgE levels are typically assayed by standard -ELISA techniques well known in the art. Typically, IgE levels-are undetectable by this technique below about 3 ng/ml.
  • IgE was directly eliminated using a monoclonal anti-IgE antibody.
  • Normal BALB/c mice were infected with Schistosoma mansoni cercariae and treated weekly with a total of 400 ⁇ g of anti-IgE mAb.
  • This high dose treatment reduced serum IgE to undetectable levels during the eight week course of the infection (Fig. 1) .
  • a second group of mice treated with a lower dose of anti-IgE mAb weekly (240 ⁇ g/total anti- IgE mAb) had measurable IgE responses (less than 50 ⁇ g/ml) during the last two weeks of the infection. These levels were markedly reduced compared to infected mice treated with the isotype control antibody (Ab) which exhibited typically high serum IgE levels (240 ⁇ g/ml) by the eighth week of infection.
  • mice were killed by intraperitoneal injection of 15 mg sodium barbital and 30 units of heparin in 0.25 ml PBS.
  • Adult worms were recovered by perfusion of the portal venous system (Arniri, P. et al . , Nature 356:604-607 (1992)) .
  • livers were homogenized for 20-30 seconds in 25 ml 1% trypsin in PBS. The mixture was incubated at room temperature for 3-4 hour, resuspended, then 20 ⁇ l samples removed for microscopic evaluation. The results are reported as the mean total egg number of ten independently counted samples per liver + standard deviation.
  • mice In the high dose (400 ⁇ g) mAb treated mice the overall cellular inflammatory reaction as measured by increases in the spleen (Fig. 2A) and liver (Fig. 2B) weight, was diminished by approximately 50% when compared to control IgG treated mice, presumably due to a decrease in egg production. Interestingly, mice that produced IgE only during the last two weeks of the infection (240 ⁇ g (low dose) ) had equivalent numbers of eggs and equivalent increases in organ weight as the IgG treated animals. This finding implies a relationship between IgE synthesis in response to egg production and the ensuing cellular infiltration into the spleen and liver. Similarly, SJA/9 mice, which are genetically deficient in IgE, show a reduced granulomatous response to S.
  • the key pathological event in schistosomiasis is chronic inflammation, characterized by granuloma formation around schistosome eggs trapped in the portal venules of the liver (Cheever, A.W. et al . , Am. J. Trop . Med. yg. 40:60-71 (1989)); Olds, G.R. et al . , J. Infect . Dis . 159:798-901 (1989); Prakash, S. et al . , J. Immun . 144:317-322 (1990)) . Histopathological examination of the infected animals revealed that organ size correlated with the tissue inflammatory response (Figure 3A) .
  • schistosome eggs are a powerful stimulus for clonal expansion and activation of the T ⁇ subclass of CD4* T cells (Pearce, E.J. et al . , J. Exp . Med. 173:159-166 (1992); Grzych, J.M. et al . , Immun . 146:1322-1327 (1991)) .
  • T H2 cells release specific cytokines, including interleukin 4 (IL-4) (Mosmann, T.F. et al . , Jinn . Rev. Immun .
  • IgE may play a role in protecting the parasite from an effective anti-parasite response. Since the elimination of IgE also resulted in profound suppression of IL-4, it is possible that this immunoglobulin isotype may skew the T H response to schistosome eggs.
  • Previous reports have established an association with T H1 stimulation and protection against adult worms versus T H2 stimulation and egg-induced immunopathology (Scott, P. et al . , Immun . Rev. 112:161-182 (1989)). Indeed, it has been suggested that, in mice, the T j ⁇ response to schistosoma eggs results in both immunopathogenesis and down-regulation of the T H1 response (Vella, A. et al .
  • IFN- ⁇ levels were measurable in the supernatants of concanavalin A stimulated spleen cells taken from uninfected mice and from infected mice treated with anti-IgE or control antibody.
  • IFN- ⁇ levels in the cultures were greatly suppressed eight weeks after infection (560 ng/ml uninfected mice versus 18 ng/ml infected mice) .
  • splenic lymphoid cells were evaluated for differential surface marker expression eight weeks after infection with cercariae.
  • IL-4 is known to increase cell surface expression of the low affinity receptor for IgE (FceRII) , CD23 (Kikutani,
  • IgE/FceRII interaction in vi tro has been shown to effect immunoglobulin isotype selection and to stimulate B cell proliferation (Scott, P., et al . , Immun . Rev. 112:161-182 (1989) ) .
  • interference with IgE synthesis by blocking IgE interactions with CD23-bearing B cells could explain the ability of relatively low doses (lOO ⁇ g/week) of the anti-IgE antibody to totally eliminate the very high IgE levels (240 ⁇ g/ml) normally stimulated by this parasite.

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Abstract

Cette invention concerne un procédé de prévention et de traitement de la parasitose par administration d'un antagoniste de l'IgE. L'invention concerne également les compositions pharmaceutiques et les molécules bispécifiques utilisées dans ce procédé.
PCT/US1995/000087 1994-01-18 1995-01-05 PROCEDE DE TRAITEMENT DE LA PARASITOSE A L'AIDE D'ANTAGONISTES DE L'IgE WO1995019181A1 (fr)

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JP51821495A JP3825798B2 (ja) 1994-01-18 1995-01-05 ＩｇＥアンタゴニストを用いる寄生虫感染症の治療法
APAP/P/1996/000875A AP660A (en) 1994-01-18 1995-01-05 A method of treatment of parasitic infection using IgE antagonists.
EP95907302A EP0739214B1 (fr) 1994-01-18 1995-01-05 PROCEDE DE TRAITEMENT DE LA PARASITOSE A L'AIDE D'ANTAGONISTES DE L'IgE
DK95907302T DK0739214T3 (da) 1994-01-18 1995-01-05 Fremgangsmåde til behandling af parasitinfektionerunder anvendelse af IgE antagonister
DE69501817T DE69501817T2 (de) 1994-01-18 1995-01-05 Verfahren zur behandlung von parasitären infektionen unter verwendung von ige-antagonisten
MX9602818A MX9602818A (es) 1994-01-18 1995-01-05 Un metodo de tratamiento de infeccion parasitaria usando antagonistas ige.

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US18408394A 1994-01-18 1994-01-18
US08/184,083 1994-01-18

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AP9600875A0 (en) 1997-01-31
ATE164079T1 (de) 1998-04-15
US5656273A (en) 1997-08-12
JP3825798B2 (ja) 2006-09-27
EP0739214A1 (fr) 1996-10-30
AP660A (en) 1998-08-18
EP0739214B1 (fr) 1998-03-18
MX9602818A (es) 1997-06-28
DK0739214T3 (da) 1998-10-07
JPH10503749A (ja) 1998-04-07
DE69501817D1 (de) 1998-04-23
DE69501817T2 (de) 1998-09-10
PH31447A (en) 1998-11-03

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